This was the surprise of the group. While priced aggressively it claims 500 lumens and has to slug it out, feature set wise, with other WXGA projectors at 500, 800 and 1000 lumens. Turns out though, that in brightness, Optoma was the most conservative, and as it turns out, unless selecting a “brightest mode” with poor color, none of the other projectors in this group measured significantly brighter.
The ML550 was the lightest projector of the five, the only one under 1lb. but with its power brick, it still is a two pound package. No one’s going to complain about a usable 441 lumens with respectable color (the ML550 did measure higher than it’s 500 lumen claim, in its brightest mode). Like the others the ML550 is well endowed with player features supporting Microsoft Office, pdfs, and a large range of photo and video formats.